32 _ THE ROOT. 
three parts:—the caudex, body, or middle part, sometimes 
much enlarged, as in the Turnip and Carrot ;—the collar, 
coilet, crown, or life-knot, the place where the root and stem 
are joined, which may be considered either the lower part 
the stem or upper part of the root, and from which, in 
ennial roots the bud of the annual stem springs ;—and t! 
radicles, fibrils, rootlets, or small fibres, in which = 
terminates inferiorly. 
84. The radicles or fibrils are always present, and are 
sential, as it is these alone that imbibe nutritious matter f 
the soil. They constitute the true root. This absorbit 
power resides in the extremity of each radicle, at which 
there is an expansion of the cellular tissue, called a spo 
provided with numerous pores, through which the fluids 
A.simple experiment, performed by Senebier, shows 
He took a radish, bent it, and placed the curve in water, 
extremity of the root being above the surface of the 
It soon began to fade. But on placing the extremity: 
fibre in water, the remainder being out of the water, it 
and throve well. The fibrils are composed of cellular 
~ and ducts. 
Ee _ 86. Roots are divided, according to their duration, 
86. ANNvAL roots produce the hikes: flowers, and: 
in one season, and then entirely perish. Barley (H 
and the Red Poppy (Papaver rheas) are examples. 
often consist merely of a bunch of rootlets, as in the 
87. Brkwexas, roots produce herbage in the first 
